WO2001032353A1

WO2001032353A1 - Assembly tool

Info

Publication number: WO2001032353A1
Application number: PCT/EP2000/009471
Authority: WO
Inventors: Martin Hering; Karl Aage Lindholm Jensen
Original assignee: Alfa Laval Lkm A/S
Priority date: 1999-11-05
Filing date: 2000-09-28
Publication date: 2001-05-10
Also published as: EP1230066A1; US20040205952A1; EP1230066B1; DK1230066T3; ATE256526T1; JP2003512938A; US6862789B1; AU763077B2; AU7908600A; US6928714B2; DE19953475A1; DE50004821D1

Abstract

The invention relates to an assembly tool for assembling a sealing ring (3) in a ring groove (4, 9) of a machine component (1, 7), especially a valve disc (7). The aim of the invention is to produce the assembly tool in a simple and cost-effective manner. The assembly tool (10, 23) comprises a pneumatic piston-cylinder unit (11, 12, 26, 27) for evenly pressing the sealing ring (3) into the ring groove (4, 9). The inventive assembly tool is versatile, can be used in a mobile manner and enables to reliably assemble sealing components in such a way that nobody is injured.

Description

assembly tool

The invention relates to an assembly tool for the assembly of a sealing ring in an annular groove of a machine part, in particular Ventl ltel lers.

Assembly tools are already known in which the seal is pressed into the sealing groove by means of a hydraulic press. Such hydraulic presses are complex and expensive to manufacture. In addition, they are large and heavy and therefore not easy to transport. For this reason, the user usually only purchases a single device and installs it in a central location in a workshop and maintenance room. This in turn requires that the individual machine parts, for example valve disks, be brought into the central maintenance room for the renewal of the seals in order to insert the new sealing rings there.

Hand tools are also known, such as a type of screwdriver with a broad rounded end, with the aid of which a sealing ring can be pressed piece by piece from the outside into an annular groove. For this

However, the method requires considerable physical effort and skill on the part of the user, who often incurs injuries. In addition, this method does not lead to reliable results because the seal is often damaged during assembly.

The object of the invention is to provide an assembly tool of the type mentioned above, which is relatively simple and inexpensive to manufacture and is simple and safe to use.

This object is achieved according to the invention in that the assembly tool has a pneumatic piston-cylinder unit for uniformly pressing in the sealing ring m includes the annular groove. The crf 1 according to pneumatic piston-cylinder unit relieves the mechanic of the strenuous work and reduces the risk of injury. By evenly pressing in the sealing ring, damage can be avoided on the one hand and on the other hand a correct fit of the pressed-in sealing ring can be ensured. The assembly tool according to the invention does not need to be stationed in a central location, because, in contrast to known, hydraulically driven tools, a pneumatic drive can be connected to the compressed air supply lines which are already present in the workshop. The assembly tool can therefore be constructed in a simple manner, which reduces the production costs and the maintenance costs and improves the reliability in tough everyday use. Furthermore, the assembly tool according to the invention is easy and convenient to transport.

In a preferred embodiment of the assembly tool, the pneumatic piston

Cylmder-Emheit a working piston with an axially projecting, ring-shaped mounting section, which presses the sealing ring to be assembled evenly into the ring groove by applying compressed air to the piston-cylinder unit.

In a further advantageous embodiment of the invention it is provided that the annular mounting portion of the working piston on the radially inner side of its free end is provided with a circumferential recess for guiding the sealing ring, the flanks of the

Recess are chamfered such that they compress the sealing ring on the one hand when the working piston is axially displaced and on the other hand they press the annular groove into it. The aforementioned embodiment can be used particularly advantageously in connection with an improved ring seal specially designed for automatic assembly with the assembly tool according to the invention, in which the sealing ring has two circumferential projections which are arranged parallel to one another such that they have a cross section V between them - Include a shaped recess.

The sealing ring designed in this way is preassembled on the annular groove in such a way that the V-shaped recess opens toward the annular groove. During the automatic assembly with the assembly tool, the sealing ring is first pressed together by the working piston, so that the V-shaped recess closes. The sealing ring compressed in this way receives a radially inward force component from an edge or preferably a beveled flank of the working piston, through which the sealing ring is pressed into the annular groove. The cross-section of the annular groove is preferably widened toward the base of the groove, so that the cross-section of the sealing ring which elastically expands within the annular groove firmly anchors it in the annular groove.

In an advantageous embodiment of the invention has a particularly for use with a machine part, in which an outer annular groove on a

Sealing section is arranged, a suitable assembly tool on a working piston which can be axially supported on an axial side of the sealing section of the machine part or on the sealing ring. Furthermore, the assembly tool has at least one flange part with a support section that can be axially supported on the other axial side of the sealing section or on the sealing ring, and a flange section that can be firmly connected to a corresponding flange section of the cylinder part for sealing assembly. These measures allow one Safe and firm positioning of the assembly tool on the machine part, which ensures the correct assembly of the sealing ring without damaging it.

For the detachable connection of the flange sections of the cylinder part and the flange part, a clamp, in particular a profile clamp connection, is preferably provided, which is simple to install and just as easy to dismantle after use.

In an advantageous embodiment of the invention, it is provided that the respective flange section of the cylinder part and flange part is designed in the form of a standard flange known for connecting valves and pipes, and the clamp is in the form of an associated known standard clamp.

In this embodiment, standard parts that are easy to obtain, in particular the standard clamp, can advantageously be used. It is not only the procurement of the parts that is cheaper. It is also advantageous that the user of the assembly tool is mostly used to handling the standard flanges and the standard clamp. This means that handling can be carried out quickly and without errors right from the start.

In an advantageous embodiment, the flange part is annular around a radially inner recess. This allows use in machine parts such as valve dividers which are fixedly connected to axially extending actuating rods or the like. The ring-shaped flange part can be mounted on such machine parts in such a way that the axially projecting actuating rods protrude through its radially inner recess. For the same reason, a configuration lorrn can also be advantageous in which the cylinder part and the working piston are annular in shape around a radially inner recess.

Another embodiment provides that the cylinder part and the working piston are pot-shaped. This embodiment is simpler to manufacture, but is only suitable for those machine parts which do not have a substantial axial projection on the axial side on which the piston-cylinder unit is to be mounted. This is the case, for example, with flat valve disks that are only connected to an actuating rod on the other axial side.

In an advantageous method for assembling a sealing ring in an external annular groove of a machine part, in particular valve plate, using an assembly tool of the type described above, the following method steps are provided:

The sealing ring is preassembled by hand on the machine part so that it lies on the outside of the ring groove;

a pneumatic piston-cylinder unit is placed on one axial side of the machine part on this or on the sealing ring and held;

a flange part is on the other axial side of the

Machine part placed on this or on the sealing ring and firmly connected to the piston-cylinder unit by means of a clamp;

The piston-cylinder unit is pressurized with compressed air so that the working piston with its axially projecting, annular mounting section presses the sealing ring evenly into the annular groove; the assembly tool is removed from the machine part, preferably after relieving the pressure on the piston-cylinder unit and after loosening the clamp.

Exemplary embodiments of the invention are explained in more detail below with reference to the drawing. Show it:

Fig. 1 is a sectional view of a

Closing element for a valve, with a preassembled sealing ring;

Fig. 2 shows the closing element of Figure 1 with an attached mounting tool in a first

Embodiment, before pressing in the sealing ring;

3 as in FIG. 2, but after the sealing ring has been pressed in;

4 shows a representation corresponding to FIG

Valve disk;

5 shows the valve disk from FIG. 4 with the mounting tool attached to it in a second embodiment, before the sealing ring is pressed in;

6 like FIG. 5, but after the sealing ring has been pressed in.

1 shows a closing element 1 of a double seat valve, not shown, as is used in the food industry for handling, for example for filling, pasty foods. The closing element 1 has a circumferential sealing section 2 which projects obliquely radially outwards and which is provided with an annular groove 4 which is open radially outwards A sealing ring hier used here differs from simple O-Rinq seals by two circumferential projections 6, which are arranged parallel to one another in such a way that they enclose a recess 5 with a V-shaped cross section between them.

2 shows an assembly tool 10 fastened to the closing element 1. This consists of an annular working piston 11, which is arranged axially displaceably in a likewise annular cylinder part 12, and a flange part 13, the sealing ring 3 between a support section 14 of the flange part 13 and an axially projecting, annular mounting section 15 of the working piston 11 is clamped. For better guidance during assembly, the assembly section 15 of the working piston 11 has a circumferential recess 16 on the radially inner side.

The flange part 13 has a radially outwardly projecting flange section 17 which can be firmly connected to a corresponding flange section 18 of the cylinder part 12. The flange sections 17, 18 are designed in the form of known standard flanges and are held together with a standard clamp, not shown.

In an inner recess 19 of the cylinder part 12 there is an axially projecting section 20 of the

Closing element 1 place, the sealing portion 2 is arranged within a radially inner recess 21 of the flange part 13.

Figure 2 shows the situation after the positioning of the assembly tool 10 on the closing element 1. To assemble the sealing ring 3, the interior 22 of the piston-cylinder unit 11, 12 is now pressurized with compressed air, the sealing ring 3 between the assembly section 15 of the Working piston 11 and the support section 14 of the flange part 13 is first axially compressed and finally radially pressed into the annular groove 4. This situation is shown in FIG. 3. The annular groove 4 widens radially inward in the axial direction, so that the sealing ring 3 can expand elastically in the interior of the annular groove 4 and is thus firmly anchored in the annular groove 4.

After loosening a standard clamp, not shown, which has firmly connected the two standard flanges 17, 18 to one another during the press-in process, the piston-cylinder unit 11, 12 on the one hand and the flange part 13 on the other hand can be removed from the closing element 1. This completes the assembly of the sealing ring 3.

FIG. 4 shows a valve closing element designed as a valve disk 7, in which a radially outwardly projecting sealing section 8 is provided with an asymmetrical annular groove 9.

FIG. 5 shows a modified assembly tool 23, which likewise comprises a piston-cylinder unit and a flange part 24. The flange part 24 in turn has a support section 25 which bears on one axial side of the sealing section 8 of the valve disk 7. The piston-cylinder unit consists of an essentially cup-shaped working piston 26, which is arranged axially displaceably in a likewise cup-shaped cylinder part 27. The working piston 26 also has an axially projecting, annular mounting section 28 which has a circumferential recess 29 on its radially inner side for guiding the sealing ring 3.

Figure 5 shows the situation after the positioning of the assembly tool 23 on the valve plate 7. To assemble the Sealing ring 3 is now pressurized to the interior 30 of the piston-cylinder unit 26, 27, as a result of which the working piston 26, as shown in FIG. 6, moves in the direction of arrow 31. The sealing ring 3 between the recess 29 of the

Working piston 26 and a radially projecting groove wall 32 of the sealing portion 8 formed on the valve plate 7 are pressed together and pressed obliquely downward and radially inward into the annular groove 9.

After loosening a standard clamp, not shown, which has firmly connected the two standard flanges 17, 18 to one another during the press-in process, the piston-cylinder unit 26, 27 on the one hand and the flange part 24 on the other hand can be removed from the valve plate 7. This completes the assembly of the sealing ring 3.

LIST OF REFERENCE NUMBERS

1. closing element

2. Sealing section

3rd sealing ring

4. Ring groove

5. Recess

6. Head start

7. Valve disc

8. Sealing section

9. Ring groove

10. Assembly tool

11. Piston

12. Cylinder part

13. Flange part

14. Support section

15. Assembly section

16. Recess

17. Flange section

18. Flange section

19. Recess

Section 20

21. Recess 22. Interior

23. Assembly tool

24. Flange part

25th support section

26. Piston

27. Cylinder part

28th assembly section

29. Recess

30. Interior

31. Direction of arrow

32. groove wall

Claims

claims

1. Assembly tool for the assembly of a sealing ring (3) in an annular groove (4, 9) of a machine part (1, 7), in particular valve divider (7), characterized in that the assembly tool (10, 23) eme pneumatic piston-cylinder Emheit (11, 12, 26, 27) for uniformly pressing the sealing ring (3) into the annular groove (4, 9).

2. Assembly tool according to claim 1, characterized in that the pneumatic piston-cylinder unit has a working piston (11, 26) with an axially projecting, annular mounting section (15, 28), which is acted upon by the piston-cylinder unit

Compressed air presses a sealing ring (3) evenly into the annular groove (4, 9).

3. Assembly tool according to one of the preceding claims, characterized in that the annular assembly section (15, 28) of the

Working piston (11, 26) is provided on the radially inner side of its free end with a circumferential recess (16, 29) for guiding the sealing ring (3), the flanks of the recess (16, 29) being chamfered in such a way that they are at an axial displacement of the working piston (11, 26) on the one hand compress the sealing ring (3) and on the other hand m the annular groove (4, 9).

4. Assembly tool according to claim 2 or 3, in particular for use with a machine part, in which an external annular groove (3) on a radially outwardly projecting Sealing section (2, 8) is arranged, characterized in that the working piston (11, 26) of the assembly tool (10, 23) can be axially supported on an axial side of the sealing section (2) of the machine part (1) or on the sealing ring (3) , and that the assembly tool (10, 23) has at least one flange part (13, 24) with a support section (14, 25) axially supported on the other axial side of the sealing section (8) or on the sealing ring (3) and a flange section (17) which can be fixedly connected to a corresponding flange section (18) of the cylinder part (12, 27) for sealing assembly.

5. Assembly tool according to claim 4, characterized in that eme clamp for releasable

Connection of the flange sections (17, 18) of the cylinder part (12, 27) and flange part (13, 24) is provided.

6. Assembly tool according to claim 5, characterized in that the respective flange section

(17, 18) of the cylinder part (12, 27) and flange part (13, 24) in the form of a standard flange known for connecting valves and pipes, and the clamp shape being an associated known standard clamp.

7. Assembly tool according to one of the preceding claims, characterized in that the

Flange part (13, 24) around a radially inner recess (21) is annular.

8. Assembly tool according to one of the preceding claims, characterized in that the

Cyl derteil (12) and the working piston (11) around an inner recess (19) are annular.

9. Assembly tool according to one of claims 1 to 7, characterized in that the cylinder part (27) and the working piston (26) are cup-shaped.

10. Seal for mounting in an annular groove (4, 9) of a radially outwardly projecting sealing section (2, 8) of a machine part (1), in particular valve disk (7), by means of a

Assembly tool (10, 23) according to one of the preceding claims, characterized in that the sealing (3) has two circumferential projections (6) which are arranged parallel to one another in such a way that they are one between them

Include cross-section V-shaped recess (5).

11. Method for assembling a sealing ring (3) in an external annular groove (4, 9) of a machine part (1, 7), in particular valve divider (7), using an assembly tool (10,

23) according to one of the preceding claims, characterized by the following method steps:

The seal (3) is pre-assembled on the machine part (1, 7) by hand so that it is on the outside of the ring groove

(4, 9) is present;

A pneumatic piston-cylinder unit (11, 12, 26, 27) is placed on one axial side of the machine part (1, 7) on this or on the seal (3) and held there;

a flange part (13, 24) is on the other axial side of the machine part (1, 7) to this or applied to the gasket (3) and firmly connected to the piston-cylinder unit (11, 12, 26, 27) by means of a clamp;

the piston-cylinder Emheit (11, 12, 26, 27) is pressurized with compressed air so that the

Working piston (11, 26) with its axially projecting, annular mounting section (15, 28) presses the seal (3) evenly into the annular groove (4, 9);

- The assembly tool (11, 23) is from

Machine part (1, 7) removed, preferably after relieving the pressure of the piston-cylinder unit (11, 12, 26, 27) and after loosening the clamp.